一、防旱浇水。入秋后，当20－40厘米土壤含水量低于田间最大持水量的55％时，就要他浇保根、保叶、攻挑水。浇水时间可持续到9月中旬。在抗旱的同时，还要防涝排水。二、报外追肥。对缺肥棉田要及时亩喷1％－2％的尿素液70千克，缺磷。缺钾的地块，亩喷施300－500倍磷酸二氢钾 First, drought watering. After autumn, when the soil moisture content of 20-40 cm is lower than 55% of the maximum water holding capacity in the field, it is necessary for him to pour the root, leaf and pick water. Watering can last until mid-September. In the drought at the same time, but also waterlogging drainage. Second, the newspaper top-dressing. To shorten the cotton fields mu mu spray 1% -2% of the urea solution 70 kg, phosphorus deficiency. K plot of potassium, mu spraying 300-500 times potassium dihydrogen phosphate